Composition of matter for use in foundry practice.



Toall whom-it may concem:

matter for use in foundry practice and has boards and patterns whichwill be capable of being molded to the form or shape desired while inplastic condition'and when dried will retain the shape or form to whichit has been molded .and will be sufiiciently strong to stand withoutbreaking or changeof form or shape repeated use under the jarring actionof the molding machines.

With these and other objects hereinafter explained in view, my inventionconsists in the composition of-matter hereinafter described and claimed.e composition of matter of my invenition is made up of sand, Portlandcement a hite or 1aplumba 9 an d L gligggs mlxed together wit Tfiiseeoil to form aplastic zmass. I prem the ingredients of my composition inthe following propore tions, about fifty parts sand preferably sharpsand such as that own as Ca e %age, about three parts of Portlandcement, a out three parts of rap 1 e or preferably boiled oil,sufiicient o1 e1ng used to cause t e composition to hold together in aplastic or semi-plastic mass.

The sand and other dry ingredients are first thoroughly mixed togetherand the oil then added and the whole worked over until the oil isthoroughl lncorporated so that the mass is uniform t roughout.

"In the use of the composition above described for making up followboards, it is rammed up and sllcked to conform with the joint or partingof the pattern and is allowed to set and dry. In about an hours time inany ordinary temperature the oil and litharge react to produceconsiderable heat, and when the heat dies away, the composition hardensin the form or shape given to it without expansion or contraction ones;i-

UNITED, STATES PATENT OFFICE.

FREDERICK SHIRLEY KNAPPER, OF SPRINGFIELD, OHIO.

Application filed May s, 1918. Serial No. 233,3

Be it known that I, FREDERICK S. KfiAP- In makingmolds it is customaryto use a for its object to produce a composition of. matter suitable foruse in making follow-- um a o 'in powdered form about one part 0%lltgare and twelve to fifteen parts of linsee 01 t5 and when thoroughlyhardened, which usu- I D/ F} COMPOSITION OF MATTER FOR USE IN FOUNDRYPRACTICE. 1

1,288,035. Specification of Letters Patent. Patented Dec, 17, 1918,

No Drawing.

ally takes fromthree to si'xhours, it is ready for use.

1 The composition above described is also particularly adapted formaking patterns.

pattern split in two and mount each part on aboard, one part being usedin the drag and the other in the cope, the two parts of-the mold beingput together for casting. This requires considerable skill and when itis impossible or undesirable to split the pattern it requires a greatdeal of skill to complete the two parts of the mold so that they can bebrought together to make an accurate mold.

- By the use of. my composition, a pattern from which a casting is to bemade may be embedded in'a mass of my composition to the. dividing line,if the pattern is not split and a half mold thus made against which onehalf mold may be rammed and then the other part of the pattern similarlytreated and the other half of the mold rammed, thus producin the dragand cope without the exercise of 51c skill ordinarily required. 7

I have found in practice that by the use of my composition in this waymolds may be made from patterns requiring flasks from 12 inches by 12inches up to 36 inches, and I have found also that it is possible by theuse of my composition in the manner indicated, to mount any and allpatterns irrespective of size or shape without the aid of a secondpattern.

The compositiomwhen in plastic condition is readily molded to take andretain the fine lines of a pattern and does not change its shape or formin setting and hardening.

Many other uses may be readily made of the composition whenever it isdesirable to take and retain the shape or form of a pattern. Usually itis desirable to coat the mold or pattern formed from the compositionwith shellac. When so coated or even without such coating the mold orpattern formed of my composition will last for repeated use. I have usedmolds or patterns made of my composition at least five hundred times,and with reasonable care, there is no limit to the number of times sucha mold or pattern may be used.

The above mentioned proportions of ingredients may be varied somewhatand raw used, but there is not the same heating with 1. A composition ofmatter for use in foundry practice consisting of sand, cement andgraphite in proper proportions mixed with litharge and a vegetable oilto form a plastic mass, the litharge and oil being in such proportionsas, by reaction, t a produce a substantial heating of the mass.

FREDERICK SHIRLEY KNALPPER.

(lopies at this patent may be obtained for five cents each, byaddressing the Gomminloner of Patents, 5

I -Washington,D.0."

